Fuel-feed device



July 3, 1934- L. KLl-:TETSCHKA 1,965,498

FUEL FEED DEVICE Filed Feb. le, 1932 2 sheets-sheet l l I A @bf July 3,1934. l.. KLETETSCHKA 1,965,498

y FUEL FEED DEVICE Filed Feb. 16, 1932 2 Sheets-Sheet 2 Patented July 3,1934 FUEL-FEED DEVICE Leo Kletetschka, Libcice, CzechoslovakiaApplication February 16, 1932, Serial No. 593,394 In CzechoslovakiaFebruary 17, 1931 2 Claims.

Feed devices for pulverized fuel are known in which the pulverized fuelis taken from a supply bunker by means of a delivery drum provided onits periphery with recesses, for example corrugations, grooves, pocketsor the like, and falls from the said recesses into an air conduitpassing thereunder in order to ensure complete discharge of therecesses. More particularly it has been proposed to allow the aircurrent to pass lengthwise along the discharging recesses in theirlowermost position.

The known feed devices of this type suier from the disadvantage thatregulation of the pulverized fuel-air mixture is only possible withdiificulty, if at all. The pulverized fuel contained in the recesses ofthe revolving delivery drum is discharged in constant amount into theair conduit even if only a weak conveyor air current or no air currentis passing through the conduit, so that when the normal air current setsin, the latter is over-saturated with pulverized fuel and this leads totrouble in operation.

This disadvantage is remedied according to the invention by avoiding theautomatic free discharge of the recesses of the delivery drum into theair conduit, the conveyor air, in passing lengthwise through therecesses, discharging the said recesses directly. Hence, when the aircurrent becomes weaker or stops altogether, the pulverized fuelremaining in the recesses is returned either partly or entirely to thesupply bunker.

The invention is illustrated in the accompanying drawings by oneembodiment shown in side elevation in Figure 1 and in plan in Figure 2.Figures 3, 4 and 5 show two constructional forms of the delivery discand conveyor air conduit in which Figs. 3 and 5 are sectional views oftwo embodiments and Fig. 4 is an end view of Fig. 5.

The delivery disc 3 keyed to the shaft 2 is enclosed in a casing 1 whichis connected by means of the hopper 5 to the pulverized coal container.The delivery disc 3 is provided on the periphery with suitable recesses4, for example, corrugations, grooves, pockets or the like. The airconveyor conduit 6 passes through the casing l at a point whereautomatic free discharge of the recesses of the delivery disc containingthe pulverized coal cannot take place, and preferably in (Cl. 3D2-49)such a manner that the axis of the air conduit passes approximatelythrough the recesses of the disc 3. It is preferable to make the blastconduit 6 nozzle shaped, for example, such that the conduit 6' iscontracted at the part 'l or the conduit 6 is contracted at the parts 7and 8 (Figures 3, 4 and 5). The velocity of the air current is therebyincreased in `the region of the recesses and in addition, the aircurrent is so guided as to effect certain and correct discharge of therecesses and suitable mixing of the air with the pulverized fuel.

As clearly seen in Figure l the air conduit 6 is provided so that theair will be forced past the periphery of the disc and through therecesses at a point which is above the horizontal diameter of the disc.

The air conduit may, however, be

I claim:-

1. A feed device for pulverized fuel or the like, comprising a casingadapted to receive the fuel to be fed, a fuel delivery disc rotatablymounted in a vertical plane in said casing and having a relatively largenumber of teeth and recesses in the periphery thereof -to receive thefuel from the casing, and an air conduit arranged parallel to the axisof the rotatable disc and above the horizontal diameter of the disc, theperiphery of the disc passing through the conduit so that the airpassing through the conduit will force and remove the fuel from therecesses, and the position of the conduit preventing the fuel fromfalling out of Vor leaving the recesses by itself unless forced to do soby the air stream.

2. A feed device according to claim l, in which the conduit iscontracted at the part adjacent both sides of the disc to increase thevelocity of the air stream.

LEO KLETETSCHKA.

